* Added geoip_db_avail() to check for DB availability (file found)
* Added geoip_db_filename() to get the internal file name of the library
* Added geoip_db_get_all_info() to fetch all info about all database types
* Added some tests so that make test can crunch something.
* Added database file path and name in warning when DB is not found.
* Added geoip.custom_directory php.ini option to change default path for DBs